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地质论评  2011 

内蒙古大青山北麓蓝晶石榴长英质片麻岩的发现:岩相学、地球化学和锆石SHRIMP定年

Keywords: 蓝晶石榴长英质片麻岩,SHRIMP定年,大青山,华北克拉通

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Abstract:

最近1:5万地质填图发现,在华北克拉通西部阴山地块西乌兰不浪地区的高级变质杂岩中,存在一套由蓝晶石榴长英质片麻岩、石墨蓝晶石榴长英质片麻岩、石墨石榴长英片麻岩和石榴蓝晶石英岩构成的岩石组合(蓝晶石榴长英质片麻岩组合)。它们以构造残片形式产于由太古宙兴和岩群和紫苏石英闪长质―紫苏斜长花岗质―紫苏花岗质片麻岩(狼牙山片麻岩)为主构成的高级变质杂岩之上,以富Al2O3、TiO2,低MgO、FeO、CaO、MnO,贫K2O、Na2O为特征。与工作区南部孔兹岩带中的富铝片麻岩相比,明显贫K2O、Na2O,亏损大离子亲石元素Rb、Ba、Sr和高场强元素Nb、Ta,稀土总量低和轻稀土相对亏损。岩石中主要存在2461~2542Ma和2349~2399Ma两组碎屑锆石,其结构和组成特征表明既有来自岩浆岩物源区也有来自变质岩物源区。可靠的最年轻锆石年龄为约2.15Ga,但其成因难以准确确定(碎屑锆石或变质锆石)。然而,结合其它方面的综合研究,蓝晶石榴长英质片麻岩组合的原岩很可能形成于古元古代晚期,与研究区南侧孔兹岩带广泛分布的孔兹岩系变质岩一道,构成古元古代晚期西部造山带的不同构造岩片。

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